| Current Path : /sys/kern/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/kern/tty_pts.c |
/*-
* Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
* All rights reserved.
*
* Portions of this software were developed under sponsorship from Snow
* B.V., the Netherlands.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/kern/tty_pts.c 225617 2011-09-16 13:58:51Z kmacy $");
/* Add compatibility bits for FreeBSD. */
#define PTS_COMPAT
/* Add pty(4) compat bits. */
#define PTS_EXTERNAL
/* Add bits to make Linux binaries work. */
#define PTS_LINUX
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/condvar.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/filio.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/malloc.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/racct.h>
#include <sys/resourcevar.h>
#include <sys/serial.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#include <sys/tty.h>
#include <sys/ttycom.h>
#include <machine/stdarg.h>
/*
* Our utmp(5) format is limited to 8-byte TTY line names. This means
* we can at most allocate 1000 pseudo-terminals ("pts/999"). Allow
* users to increase this number, assuming they have manually increased
* UT_LINESIZE.
*/
static struct unrhdr *pts_pool;
static MALLOC_DEFINE(M_PTS, "pts", "pseudo tty device");
/*
* Per-PTS structure.
*
* List of locks
* (t) locked by tty_lock()
* (c) const until freeing
*/
struct pts_softc {
int pts_unit; /* (c) Device unit number. */
unsigned int pts_flags; /* (t) Device flags. */
#define PTS_PKT 0x1 /* Packet mode. */
#define PTS_FINISHED 0x2 /* Return errors on read()/write(). */
char pts_pkt; /* (t) Unread packet mode data. */
struct cv pts_inwait; /* (t) Blocking write() on master. */
struct selinfo pts_inpoll; /* (t) Select queue for write(). */
struct cv pts_outwait; /* (t) Blocking read() on master. */
struct selinfo pts_outpoll; /* (t) Select queue for read(). */
#ifdef PTS_EXTERNAL
struct cdev *pts_cdev; /* (c) Master device node. */
#endif /* PTS_EXTERNAL */
struct ucred *pts_cred; /* (c) Resource limit. */
};
/*
* Controller-side file operations.
*/
static int
ptsdev_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
int flags, struct thread *td)
{
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
int error = 0;
char pkt;
if (uio->uio_resid == 0)
return (0);
tty_lock(tp);
for (;;) {
/*
* Implement packet mode. When packet mode is turned on,
* the first byte contains a bitmask of events that
* occured (start, stop, flush, window size, etc).
*/
if (psc->pts_flags & PTS_PKT && psc->pts_pkt) {
pkt = psc->pts_pkt;
psc->pts_pkt = 0;
tty_unlock(tp);
error = ureadc(pkt, uio);
return (error);
}
/*
* Transmit regular data.
*
* XXX: We shouldn't use ttydisc_getc_poll()! Even
* though in this implementation, there is likely going
* to be data, we should just call ttydisc_getc_uio()
* and use its return value to sleep.
*/
if (ttydisc_getc_poll(tp)) {
if (psc->pts_flags & PTS_PKT) {
/*
* XXX: Small race. Fortunately PTY
* consumers aren't multithreaded.
*/
tty_unlock(tp);
error = ureadc(TIOCPKT_DATA, uio);
if (error)
return (error);
tty_lock(tp);
}
error = ttydisc_getc_uio(tp, uio);
break;
}
/* Maybe the device isn't used anyway. */
if (psc->pts_flags & PTS_FINISHED)
break;
/* Wait for more data. */
if (fp->f_flag & O_NONBLOCK) {
error = EWOULDBLOCK;
break;
}
error = cv_wait_sig(&psc->pts_outwait, tp->t_mtx);
if (error != 0)
break;
}
tty_unlock(tp);
return (error);
}
static int
ptsdev_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
int flags, struct thread *td)
{
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
char ib[256], *ibstart;
size_t iblen, rintlen;
int error = 0;
if (uio->uio_resid == 0)
return (0);
for (;;) {
ibstart = ib;
iblen = MIN(uio->uio_resid, sizeof ib);
error = uiomove(ib, iblen, uio);
tty_lock(tp);
if (error != 0) {
iblen = 0;
goto done;
}
/*
* When possible, avoid the slow path. rint_bypass()
* copies all input to the input queue at once.
*/
MPASS(iblen > 0);
do {
rintlen = ttydisc_rint_simple(tp, ibstart, iblen);
ibstart += rintlen;
iblen -= rintlen;
if (iblen == 0) {
/* All data written. */
break;
}
/* Maybe the device isn't used anyway. */
if (psc->pts_flags & PTS_FINISHED) {
error = EIO;
goto done;
}
/* Wait for more data. */
if (fp->f_flag & O_NONBLOCK) {
error = EWOULDBLOCK;
goto done;
}
/* Wake up users on the slave side. */
ttydisc_rint_done(tp);
error = cv_wait_sig(&psc->pts_inwait, tp->t_mtx);
if (error != 0)
goto done;
} while (iblen > 0);
if (uio->uio_resid == 0)
break;
tty_unlock(tp);
}
done: ttydisc_rint_done(tp);
tty_unlock(tp);
/*
* Don't account for the part of the buffer that we couldn't
* pass to the TTY.
*/
uio->uio_resid += iblen;
return (error);
}
static int
ptsdev_truncate(struct file *fp, off_t length, struct ucred *active_cred,
struct thread *td)
{
return (EINVAL);
}
static int
ptsdev_ioctl(struct file *fp, u_long cmd, void *data,
struct ucred *active_cred, struct thread *td)
{
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
int error = 0, sig;
switch (cmd) {
case FIONBIO:
/* This device supports non-blocking operation. */
return (0);
case FIONREAD:
tty_lock(tp);
if (psc->pts_flags & PTS_FINISHED) {
/* Force read() to be called. */
*(int *)data = 1;
} else {
*(int *)data = ttydisc_getc_poll(tp);
}
tty_unlock(tp);
return (0);
case FIODGNAME: {
struct fiodgname_arg *fgn;
const char *p;
int i;
/* Reverse device name lookups, for ptsname() and ttyname(). */
fgn = data;
p = tty_devname(tp);
i = strlen(p) + 1;
if (i > fgn->len)
return (EINVAL);
return copyout(p, fgn->buf, i);
}
/*
* We need to implement TIOCGPGRP and TIOCGSID here again. When
* called on the pseudo-terminal master, it should not check if
* the terminal is the foreground terminal of the calling
* process.
*
* TIOCGETA is also implemented here. Various Linux PTY routines
* often call isatty(), which is implemented by tcgetattr().
*/
#ifdef PTS_LINUX
case TIOCGETA:
/* Obtain terminal flags through tcgetattr(). */
tty_lock(tp);
*(struct termios*)data = tp->t_termios;
tty_unlock(tp);
return (0);
#endif /* PTS_LINUX */
case TIOCSETAF:
case TIOCSETAW:
/*
* We must make sure we turn tcsetattr() calls of TCSAFLUSH and
* TCSADRAIN into something different. If an application would
* call TCSAFLUSH or TCSADRAIN on the master descriptor, it may
* deadlock waiting for all data to be read.
*/
cmd = TIOCSETA;
break;
#if defined(PTS_COMPAT) || defined(PTS_LINUX)
case TIOCGPTN:
/*
* Get the device unit number.
*/
if (psc->pts_unit < 0)
return (ENOTTY);
*(unsigned int *)data = psc->pts_unit;
return (0);
#endif /* PTS_COMPAT || PTS_LINUX */
case TIOCGPGRP:
/* Get the foreground process group ID. */
tty_lock(tp);
if (tp->t_pgrp != NULL)
*(int *)data = tp->t_pgrp->pg_id;
else
*(int *)data = NO_PID;
tty_unlock(tp);
return (0);
case TIOCGSID:
/* Get the session leader process ID. */
tty_lock(tp);
if (tp->t_session == NULL)
error = ENOTTY;
else
*(int *)data = tp->t_session->s_sid;
tty_unlock(tp);
return (error);
case TIOCPTMASTER:
/* Yes, we are a pseudo-terminal master. */
return (0);
case TIOCSIG:
/* Signal the foreground process group. */
sig = *(int *)data;
if (sig < 1 || sig >= NSIG)
return (EINVAL);
tty_lock(tp);
tty_signal_pgrp(tp, sig);
tty_unlock(tp);
return (0);
case TIOCPKT:
/* Enable/disable packet mode. */
tty_lock(tp);
if (*(int *)data)
psc->pts_flags |= PTS_PKT;
else
psc->pts_flags &= ~PTS_PKT;
tty_unlock(tp);
return (0);
}
/* Just redirect this ioctl to the slave device. */
tty_lock(tp);
error = tty_ioctl(tp, cmd, data, fp->f_flag, td);
tty_unlock(tp);
if (error == ENOIOCTL)
error = ENOTTY;
return (error);
}
static int
ptsdev_poll(struct file *fp, int events, struct ucred *active_cred,
struct thread *td)
{
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
int revents = 0;
tty_lock(tp);
if (psc->pts_flags & PTS_FINISHED) {
/* Slave device is not opened. */
tty_unlock(tp);
return ((events & (POLLIN|POLLRDNORM)) | POLLHUP);
}
if (events & (POLLIN|POLLRDNORM)) {
/* See if we can getc something. */
if (ttydisc_getc_poll(tp) ||
(psc->pts_flags & PTS_PKT && psc->pts_pkt))
revents |= events & (POLLIN|POLLRDNORM);
}
if (events & (POLLOUT|POLLWRNORM)) {
/* See if we can rint something. */
if (ttydisc_rint_poll(tp))
revents |= events & (POLLOUT|POLLWRNORM);
}
/*
* No need to check for POLLHUP here. This device cannot be used
* as a callout device, which means we always have a carrier,
* because the master is.
*/
if (revents == 0) {
/*
* This code might look misleading, but the naming of
* poll events on this side is the opposite of the slave
* device.
*/
if (events & (POLLIN|POLLRDNORM))
selrecord(td, &psc->pts_outpoll);
if (events & (POLLOUT|POLLWRNORM))
selrecord(td, &psc->pts_inpoll);
}
tty_unlock(tp);
return (revents);
}
/*
* kqueue support.
*/
static void
pts_kqops_read_detach(struct knote *kn)
{
struct file *fp = kn->kn_fp;
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
knlist_remove(&psc->pts_outpoll.si_note, kn, 0);
}
static int
pts_kqops_read_event(struct knote *kn, long hint)
{
struct file *fp = kn->kn_fp;
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
if (psc->pts_flags & PTS_FINISHED) {
kn->kn_flags |= EV_EOF;
return (1);
} else {
kn->kn_data = ttydisc_getc_poll(tp);
return (kn->kn_data > 0);
}
}
static void
pts_kqops_write_detach(struct knote *kn)
{
struct file *fp = kn->kn_fp;
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
knlist_remove(&psc->pts_inpoll.si_note, kn, 0);
}
static int
pts_kqops_write_event(struct knote *kn, long hint)
{
struct file *fp = kn->kn_fp;
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
if (psc->pts_flags & PTS_FINISHED) {
kn->kn_flags |= EV_EOF;
return (1);
} else {
kn->kn_data = ttydisc_rint_poll(tp);
return (kn->kn_data > 0);
}
}
static struct filterops pts_kqops_read = {
.f_isfd = 1,
.f_detach = pts_kqops_read_detach,
.f_event = pts_kqops_read_event,
};
static struct filterops pts_kqops_write = {
.f_isfd = 1,
.f_detach = pts_kqops_write_detach,
.f_event = pts_kqops_write_event,
};
static int
ptsdev_kqfilter(struct file *fp, struct knote *kn)
{
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
int error = 0;
tty_lock(tp);
switch (kn->kn_filter) {
case EVFILT_READ:
kn->kn_fop = &pts_kqops_read;
knlist_add(&psc->pts_outpoll.si_note, kn, 1);
break;
case EVFILT_WRITE:
kn->kn_fop = &pts_kqops_write;
knlist_add(&psc->pts_inpoll.si_note, kn, 1);
break;
default:
error = EINVAL;
break;
}
tty_unlock(tp);
return (error);
}
static int
ptsdev_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
struct thread *td)
{
struct tty *tp = fp->f_data;
#ifdef PTS_EXTERNAL
struct pts_softc *psc = tty_softc(tp);
#endif /* PTS_EXTERNAL */
struct cdev *dev = tp->t_dev;
/*
* According to POSIX, we must implement an fstat(). This also
* makes this implementation compatible with Linux binaries,
* because Linux calls fstat() on the pseudo-terminal master to
* obtain st_rdev.
*
* XXX: POSIX also mentions we must fill in st_dev, but how?
*/
bzero(sb, sizeof *sb);
#ifdef PTS_EXTERNAL
if (psc->pts_cdev != NULL)
sb->st_ino = sb->st_rdev = dev2udev(psc->pts_cdev);
else
#endif /* PTS_EXTERNAL */
sb->st_ino = sb->st_rdev = tty_udev(tp);
sb->st_atim = dev->si_atime;
sb->st_ctim = dev->si_ctime;
sb->st_mtim = dev->si_mtime;
sb->st_uid = dev->si_uid;
sb->st_gid = dev->si_gid;
sb->st_mode = dev->si_mode | S_IFCHR;
return (0);
}
static int
ptsdev_close(struct file *fp, struct thread *td)
{
struct tty *tp = fp->f_data;
/* Deallocate TTY device. */
tty_lock(tp);
tty_rel_gone(tp);
/*
* Open of /dev/ptmx or /dev/ptyXX changes the type of file
* from DTYPE_VNODE to DTYPE_PTS. vn_open() increases vnode
* use count, we need to decrement it, and possibly do other
* required cleanup.
*/
if (fp->f_vnode != NULL)
return (vnops.fo_close(fp, td));
return (0);
}
static struct fileops ptsdev_ops = {
.fo_read = ptsdev_read,
.fo_write = ptsdev_write,
.fo_truncate = ptsdev_truncate,
.fo_ioctl = ptsdev_ioctl,
.fo_poll = ptsdev_poll,
.fo_kqfilter = ptsdev_kqfilter,
.fo_stat = ptsdev_stat,
.fo_close = ptsdev_close,
.fo_chmod = invfo_chmod,
.fo_chown = invfo_chown,
.fo_flags = DFLAG_PASSABLE,
};
/*
* Driver-side hooks.
*/
static void
ptsdrv_outwakeup(struct tty *tp)
{
struct pts_softc *psc = tty_softc(tp);
cv_broadcast(&psc->pts_outwait);
selwakeup(&psc->pts_outpoll);
KNOTE_LOCKED(&psc->pts_outpoll.si_note, 0);
}
static void
ptsdrv_inwakeup(struct tty *tp)
{
struct pts_softc *psc = tty_softc(tp);
cv_broadcast(&psc->pts_inwait);
selwakeup(&psc->pts_inpoll);
KNOTE_LOCKED(&psc->pts_inpoll.si_note, 0);
}
static int
ptsdrv_open(struct tty *tp)
{
struct pts_softc *psc = tty_softc(tp);
psc->pts_flags &= ~PTS_FINISHED;
return (0);
}
static void
ptsdrv_close(struct tty *tp)
{
struct pts_softc *psc = tty_softc(tp);
/* Wake up any blocked readers/writers. */
psc->pts_flags |= PTS_FINISHED;
ptsdrv_outwakeup(tp);
ptsdrv_inwakeup(tp);
}
static void
ptsdrv_pktnotify(struct tty *tp, char event)
{
struct pts_softc *psc = tty_softc(tp);
/*
* Clear conflicting flags.
*/
switch (event) {
case TIOCPKT_STOP:
psc->pts_pkt &= ~TIOCPKT_START;
break;
case TIOCPKT_START:
psc->pts_pkt &= ~TIOCPKT_STOP;
break;
case TIOCPKT_NOSTOP:
psc->pts_pkt &= ~TIOCPKT_DOSTOP;
break;
case TIOCPKT_DOSTOP:
psc->pts_pkt &= ~TIOCPKT_NOSTOP;
break;
}
psc->pts_pkt |= event;
ptsdrv_outwakeup(tp);
}
static void
ptsdrv_free(void *softc)
{
struct pts_softc *psc = softc;
/* Make device number available again. */
if (psc->pts_unit >= 0)
free_unr(pts_pool, psc->pts_unit);
chgptscnt(psc->pts_cred->cr_ruidinfo, -1, 0);
racct_sub_cred(psc->pts_cred, RACCT_NPTS, 1);
crfree(psc->pts_cred);
seldrain(&psc->pts_inpoll);
seldrain(&psc->pts_outpoll);
knlist_destroy(&psc->pts_inpoll.si_note);
knlist_destroy(&psc->pts_outpoll.si_note);
#ifdef PTS_EXTERNAL
/* Destroy master device as well. */
if (psc->pts_cdev != NULL)
destroy_dev_sched(psc->pts_cdev);
#endif /* PTS_EXTERNAL */
free(psc, M_PTS);
}
static struct ttydevsw pts_class = {
.tsw_flags = TF_NOPREFIX,
.tsw_outwakeup = ptsdrv_outwakeup,
.tsw_inwakeup = ptsdrv_inwakeup,
.tsw_open = ptsdrv_open,
.tsw_close = ptsdrv_close,
.tsw_pktnotify = ptsdrv_pktnotify,
.tsw_free = ptsdrv_free,
};
#ifndef PTS_EXTERNAL
static
#endif /* !PTS_EXTERNAL */
int
pts_alloc(int fflags, struct thread *td, struct file *fp)
{
int unit, ok, error;
struct tty *tp;
struct pts_softc *psc;
struct proc *p = td->td_proc;
struct ucred *cred = td->td_ucred;
/* Resource limiting. */
PROC_LOCK(p);
error = racct_add(p, RACCT_NPTS, 1);
if (error != 0) {
PROC_UNLOCK(p);
return (EAGAIN);
}
ok = chgptscnt(cred->cr_ruidinfo, 1, lim_cur(p, RLIMIT_NPTS));
if (!ok) {
racct_sub(p, RACCT_NPTS, 1);
PROC_UNLOCK(p);
return (EAGAIN);
}
PROC_UNLOCK(p);
/* Try to allocate a new pts unit number. */
unit = alloc_unr(pts_pool);
if (unit < 0) {
racct_sub(p, RACCT_NPTS, 1);
chgptscnt(cred->cr_ruidinfo, -1, 0);
return (EAGAIN);
}
/* Allocate TTY and softc. */
psc = malloc(sizeof(struct pts_softc), M_PTS, M_WAITOK|M_ZERO);
cv_init(&psc->pts_inwait, "ptsin");
cv_init(&psc->pts_outwait, "ptsout");
psc->pts_unit = unit;
psc->pts_cred = crhold(cred);
tp = tty_alloc(&pts_class, psc);
knlist_init_mtx(&psc->pts_inpoll.si_note, tp->t_mtx);
knlist_init_mtx(&psc->pts_outpoll.si_note, tp->t_mtx);
/* Expose the slave device as well. */
tty_makedev(tp, td->td_ucred, "pts/%u", psc->pts_unit);
finit(fp, fflags, DTYPE_PTS, tp, &ptsdev_ops);
return (0);
}
#ifdef PTS_EXTERNAL
int
pts_alloc_external(int fflags, struct thread *td, struct file *fp,
struct cdev *dev, const char *name)
{
int ok, error;
struct tty *tp;
struct pts_softc *psc;
struct proc *p = td->td_proc;
struct ucred *cred = td->td_ucred;
/* Resource limiting. */
PROC_LOCK(p);
error = racct_add(p, RACCT_NPTS, 1);
if (error != 0) {
PROC_UNLOCK(p);
return (EAGAIN);
}
ok = chgptscnt(cred->cr_ruidinfo, 1, lim_cur(p, RLIMIT_NPTS));
if (!ok) {
racct_sub(p, RACCT_NPTS, 1);
PROC_UNLOCK(p);
return (EAGAIN);
}
PROC_UNLOCK(p);
/* Allocate TTY and softc. */
psc = malloc(sizeof(struct pts_softc), M_PTS, M_WAITOK|M_ZERO);
cv_init(&psc->pts_inwait, "ptsin");
cv_init(&psc->pts_outwait, "ptsout");
psc->pts_unit = -1;
psc->pts_cdev = dev;
psc->pts_cred = crhold(cred);
tp = tty_alloc(&pts_class, psc);
knlist_init_mtx(&psc->pts_inpoll.si_note, tp->t_mtx);
knlist_init_mtx(&psc->pts_outpoll.si_note, tp->t_mtx);
/* Expose the slave device as well. */
tty_makedev(tp, td->td_ucred, "%s", name);
finit(fp, fflags, DTYPE_PTS, tp, &ptsdev_ops);
return (0);
}
#endif /* PTS_EXTERNAL */
int
sys_posix_openpt(struct thread *td, struct posix_openpt_args *uap)
{
int error, fd;
struct file *fp;
/*
* POSIX states it's unspecified when other flags are passed. We
* don't allow this.
*/
if (uap->flags & ~(O_RDWR|O_NOCTTY))
return (EINVAL);
error = falloc(td, &fp, &fd, 0);
if (error)
return (error);
/* Allocate the actual pseudo-TTY. */
error = pts_alloc(FFLAGS(uap->flags & O_ACCMODE), td, fp);
if (error != 0) {
fdclose(td->td_proc->p_fd, fp, fd, td);
return (error);
}
/* Pass it back to userspace. */
td->td_retval[0] = fd;
fdrop(fp, td);
return (0);
}
static void
pts_init(void *unused)
{
pts_pool = new_unrhdr(0, INT_MAX, NULL);
}
SYSINIT(pts, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, pts_init, NULL);